--- build2-0.14.0_/libbuild2/cc/pkgconfig.cxx	2022-10-04 14:18:24.864604892 -0400
+++ build2-0.14.0/libbuild2/cc/pkgconfig.cxx	2022-10-04 14:20:58.153254961 -0400
@@ -186,7 +186,7 @@
     ;

   static bool
-  pkgconf_error_handler (const char* msg, const pkgconf_client_t*, const void*)
+  pkgconf_error_handler (const char* msg, const pkgconf_client_t*, void*)
   {
     error << runtime_error (msg); // Sanitize the message.
     return true;